小电流充电管理IC

PF4054

Standalone Linear Li-lon Battery Charger With

Thermal Regulation in ThinSOT

Description

Features

● Programmable Charge Current Up to 800mA. ● No MOSFET,Sense Resistor or Blocking Diode Required. ● Constant-Current/Constant-Voltage Operation with

Thermal

Protection to Maximize Charge Rate without Risk of Overheating. ● Charges Single Cell Li-lon Batteries Directly from USB Port.

● Preset 4.2V Charge Voltage with ±1% Accuracy. ● 25uA Supply Current in Shutdown ● 2.9V Trickle Charge Threshold ● Available Without Trickle Charge ● Soft-Start Limits Inrush Current ● Available in 5-Lead SOT-23 Package Application

● Cellular Telephones. PDA’s,MP3 Players. ● Charging Docks and Cradles PF4054 is a complete constant-current & Constant voltage linear charge for single cellLithium-ion and Lithium-Polymer batteries. Its Make PF4054 ideally suited for portable Applications. Furthermore. The PF4054 is Specifically designed to work within USB Power sprcification. At the same time,PF4054 Can also be used in the standalone lithium - Ion And Lithium-polymer battery charger. No external sense resistor is needed, and No Blocking diode is required due to the Internal MOSFET architecture. Thermal

feedback Regulates the charge current to limit the dieTemperature during high power operation or High ambient temperature. The charge voltage Is fixed at 4.2V, and the charge current can be programmed externally with a single resistor .The PF4054 aut omatically thrminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.

When the input supply ( wall adapter or USB supply ) is removed. The PF4054 automatically enters a low current stage,dropping the battery drain current to less than 2uA The PF4054 can be put into shutdown mode. Reducing the supply current to 25 uA. Other features include charge current monitor, Undervoltage lockout, automatic recharge and a status Pin to indicate charge termination and the presence of An input voltage.

● Bluetooth Applications Other features include charge current monitor,undervoltage Lockout,automatic recharge and a status pin to indicate

Charge termination and the presenceof an input voltage

1

PF4054

Absolute Maximum Rating

Parameter Symbol Value Units

Input supply Voltage

Vcc 8 V PROG Voltage VPROG VCC+0.3

V BAT Voltage VBAT 7 V CHRG Voltage VCHRG

10 V BAT Short-Circuit Duration

Continuous

BAT Pin Current IBAT 800 mA PROG Pin Current IPROG 800 µA Maximum Junction Temperature

TJ 125 ℃ Storage Temperature

TS -65 to +125

℃ Lead Temperature (Soldering,10 sec)

300

℃

Operating Rating

Parameter Symbol Value Units Supply Input Voltage VIN -0.3 to + 8 V Junction Temperature

TJ

-40 to +85

℃

Electrical Characteristics

V IN =5V;T J =25℃;unless otherwise specified.

Symbol Parameter Conditions

Min Typ Max Unit VCC Input Supply Voltage

4.25 6 V ICC Input Supply Current

Charge Mode,RPROG=10K

190

µA

Standby Mode(Charge Terminated) 85 µA

Shutdown Mode(RPROG Not Connected.VCC

12 µA

VFLOAT Regulated Output (Float)Voltage 0℃≤TJ ≤85℃,IBAT=40mA 4.2 V IBAT

BAT Pin Current

RPROG=10K,Current Mode

110

mA

RPROG=2K,Current Mode 500 mA

Standby Mode,VBAT=4.2V 4 µA

Shutdown Mode(RPROG Not Connected)

±1 µA

Sleep Mode, Vcc=0V ±1 µA ITRIKL Trickle Charge urrent VBAT

Trickle Charge Threshold Voltage

RPROG=10K,VBAT Rising

2.9

V

2